#!/bin/bash
## Functions
#find containers
containers=""
commands=""

function read_containers(){
  containers=$(
  [ -e ~/.containers ] && cat ~/.containers 2>/dev/null
  find /media/${USER} -maxdepth 2 -iname ".containers" | while read line ; do
    cat $line | awk -F';' -v path="$(dirname $line)" '{OFS=";" ; print $1,path"/"$2}'
  done)
}

function mount_container(){
  container_line=$*
  name=$(echo $container_line | cut -f1 -d';')
  path=$(echo $container_line | cut -f2 -d';')
  mount_point="/mnt/${name}"

  #mount only if containerfile is valid
  if [ -e ${path} ] && cryptsetup isLuks "${path}" ; then
    #if mountpoint is not there create it
    [ ! -e ${mount_point} ] && sudo mkdir -p "${mount_point}" && sudo chmod 777 "${mount_point}"
    #open luks Container
    sudo cryptsetup luksOpen "${path}" "${name}"
    #mount Container
    sudo mount "/dev/mapper/${name}" "${mount_point}"
  else
    echo "Container ${path} not found" && continue
  fi
}

function unmount_container(){
  container_line=$*
  name=$(echo $container_line | cut -f1 -d';')
  path=$(echo $container_line | cut -f2 -d';')
  mount_point="/mnt/${name}"

  #unmount only if mounted
  if ( mount | grep -q "${mount_point}" ) ; then
    #if still in use
    if [[ $( lsof "${mount_point}" | wc -l ) -gt 0 ]] ; then
      echo "Mountpoint ${mount_point} is still in use:"
      lsof "${mount_point}"
      continue
    else
      sudo umount -l "${mount_point}"
      sudo rmdir "${mount_point}"
    fi

    sudo cryptsetup luksClose "${name}"
  fi
}

function is_open(){
  container_path="${1}"
  ls -b /dev/mapper/ | xargs -n1 sudo cryptsetup status | grep loop: | grep -q "${container_path}"
  return $?
}

function is_mounted(){
  mount_point="${1}"
  mount | grep -q "${mount_point}"
  return $?
}

function is_used(){
  mount_point="${1}"
  lsof ${mount_point} 2>/dev/null 1>&2
  return $?
}

function is_mounted_container(){
  container_line=$*
  name=$(echo $container_line | cut -f1 -d';')
  path=$(echo $container_line | cut -f2 -d';')
  mount_point="/mnt/${name}"
  result=0
  mount | grep -q "${mount_point}" && (( result+=1 ))
  sudo cryptsetup status ${name} | grep -q "${path}" && (( result+=2 ))
  echo $result
  return $result
}

#mount all containers
function mount_all(){
  read_containers
  for line in $containers ; do
    mount_container $line
  done
}

#unmount all containers
function unmount_all(){
  read_containers
  for line in $containers ; do
    unmount_container $line
  done
}

#print status
function print_status(){
  container_line=$*
  name=$(echo $container_line | cut -f1 -d';')
  path=$(echo $container_line | cut -f2 -d';')
  mount_point="/mnt/${name}"
  echo "Stats for $name : $path"
  is_open ${path} && echo "IS OPENED"
  is_mounted ${mount_point} && echo "IS MOUNTED"
  is_used ${mount_point} && echo "IS IN USE"
}

#print status
function print_status_all(){
  read_containers
  for line in $containers ; do
    print_status $line
  done

}

##main

command="show"
[[ $# -eq 1 ]] && command="${1}"
echo "Command: ${command}"

case $command in
  mount)
  mount_all
  ;;
  unmount)
  unmount_all
  ;;
  list)
  print_status_all
  ;;
  *)
  read_containers
  echo $containers
  ;;
esac